CN113589498A - Long-wave infrared athermalization optical system - Google Patents
Long-wave infrared athermalization optical system Download PDFInfo
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- CN113589498A CN113589498A CN202110895206.5A CN202110895206A CN113589498A CN 113589498 A CN113589498 A CN 113589498A CN 202110895206 A CN202110895206 A CN 202110895206A CN 113589498 A CN113589498 A CN 113589498A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 68
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 230000005499 meniscus Effects 0.000 claims abstract description 10
- 239000005357 flat glass Substances 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 4
- 239000005083 Zinc sulfide Substances 0.000 claims description 3
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 3
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 15
- 238000003384 imaging method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 238000012546 transfer Methods 0.000 description 7
- 230000004075 alteration Effects 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention relates to a long-wave infrared athermalization optical system, which comprises a protective cover, a first lens, a second lens, a third lens, a detector window and a detector chip, wherein the protective cover, the first lens, the second lens, the third lens, the detector window and the detector chip are sequentially arranged on the same optical axis along the propagation direction of incident light; the first lens is a meniscus convex lens and is made of IRG 204; the second lens is a meniscus convex lens and is made of ZNSE; the third lens is a biconvex lens and is made of IRG 209; the front surface of the first lens is a spherical surface, the back surface of the first lens is a rotationally symmetric even-order aspheric surface, the front surface and the back surface of the second lens are both rotationally symmetric even-order aspheric surfaces, the front surface of the third lens is a rotationally symmetric even-order aspheric surface, and the back surface of the third lens is a spherical surface. The invention realizes the athermalization design of the optical system with a larger field angle, can clearly image within the temperature range of minus 40 ℃ to 60 ℃, has less lenses, reduces the structure and the weight, realizes the purposes of light and small optical system and reduces the cost.
Description
Technical Field
The invention relates to a long-wave infrared athermalization optical system, and belongs to the technical field of optics.
Background
With the continuous development of infrared technology, higher requirements are put forward on the imaging quality, the working temperature and the volume miniaturization of an infrared optical system. When the environmental temperature changes, the optical element and the mechanical element of the optical system generate heat effect, so that the image plane of the system deviates, the imaging quality is reduced, and the comprehensive performance of the infrared imaging system is finally influenced. Therefore, a athermalization design is not required to be added into the existing infrared imaging system, the influence of temperature change on the imaging optical system is eliminated or reduced, and the good imaging quality of the optical system in a larger temperature difference range is ensured. At present, when an infrared optical system is designed to be athermalized, optical athermalization is mostly realized by adopting a mode of matching various materials with aspheric surfaces or adding diffraction surfaces, lenses are more in number and higher in cost in a mode of matching various materials with aspheric surfaces, and the mode of adding diffraction surfaces can increase the processing cost and cause higher cost.
Disclosure of Invention
The invention aims to provide a long-wave infrared athermalization optical system which has the advantages of light and small structure, good optical athermalization difference, low cost and the like.
In order to solve the technical problem, the long-wave infrared athermalization optical system comprises a protective cover, a first lens, a second lens, a third lens, a detector window and a detector chip which are sequentially arranged on the same optical axis along the propagation direction of incident light; the first lens is a meniscus convex lens and is made of IRG 204; the second lens is a meniscus convex lens and is made of ZNSE; the third lens is a biconvex lens and is made of IRG 209; the front surface of the first lens is a spherical surface, the back surface of the first lens is a rotationally symmetric even-order aspheric surface, the front surface and the back surface of the second lens are both rotationally symmetric even-order aspheric surfaces, the front surface of the third lens is a rotationally symmetric even-order aspheric surface, and the back surface of the third lens is a spherical surface.
The surface type curve of the rotationally symmetrical even aspheric surface is preferably circular.
The first lens and the second lens are meniscus convex lenses with convex surfaces facing the protective cover.
The curvature radiuses of the front surface and the rear surface of the first lens are 12.067 mm-13.136 mm and 13.91 mm-15.264 mm respectively, the thickness of the first lens is 3.4 mm-3.6 mm, the coefficient of 4 times of a rotationally symmetric even-order aspheric surface of the rear surface is-1.175250E-4-8.611977E-5, the coefficient of 6 times of the first lens is-3.024415E-6-8.724273E-7, the coefficient of 8 times of the first lens is 1.018666E-8-3.947737E-8, the coefficient of 10 times of the first lens is-1.551786E-10-3.101294E-11, and the air space between the rear surface of the first lens and the front surface of the second lens is 1.58 mm-2.22 mm.
The curvature radii of the front surface and the rear surface of the second lens are 7.349 mm-8.955 mm and 6.056 mm-7.678 mm respectively, the thickness is 1.9 mm-2.3 mm, the 4-time coefficient of the rotationally symmetric even-order aspheric surface of the front surface is-3.628704E-4-1.399185E-4, the 6-time coefficient is-2.231179E-5-6.873863E-6, the 8-time coefficient is-7.220687E-7-2.005046E-7, the 10-time coefficient is 8.669295E-9-1.380952E-8, the 4-time coefficient of the rotationally symmetric even-order aspheric surface of the rear surface is-7.997778E-5-3.071890E-4, the 6-time coefficient is-6.194896E-5-2.099981E-5, the 8-time coefficient is-8.655113E-7-3.550900E-7, and the 10-time coefficient is 9.840233E-9-2.832256E-8, the air space between the back surface of the second lens and the front surface of the third lens is 4.56 mm-5.49 mm.
The curvature radii of the front surface and the rear surface of the third lens are 95.993 mm-353.501 mm and-24.872 mm-21.812 mm respectively, the thickness of the third lens is 3.4 mm-4 mm, the 4-order coefficient of a rotationally symmetric even-order aspheric surface of the front surface of the third lens is-1.821586E-5-7.077677E-6, the 6-order coefficient of the third lens is 3.320459E-7-8.799710E-7, the 8-order coefficient of the third lens is-1.575133E-8-6.699063E-9, the 10-order coefficient of the third lens is 4.990043E-11-1.218380E-10, and the air space between the rear surface of the third lens and the front surface of the detector window is 4 mm-4.17 mm.
The safety cover be zinc sulfide lens, the radius of curvature of its front and back surface is 15mm and 11 ~ 13mm respectively, and thickness is 2 ~ 4mm, the air interval of the rear surface of safety cover and the front surface of first lens is 7.4mm ~ 8 mm.
The detector window is made of germanium plate glass, the thickness of the germanium plate glass is 0.8 mm-1 mm, and the air space between the rear surface of the detector window and the front surface of the detector chip is 1.6 mm-1.8 mm.
The detector chip is an uncooled focal plane detector.
The invention has the beneficial effects that:
according to the invention, the first lens, the second lens and the third lens are matched by adopting materials with different refractive indexes and are matched with the rotationally symmetric even-order aspheric surface, so that the number of the lenses is reduced, the use of a diffraction surface is avoided, the structure is simplified, the weight is reduced, and the cost is reduced.
The invention realizes high-efficiency material collocation by reasonably distributing the focal length and refractive index materials of the first lens, the second lens and the third lens, and realizes high imaging quality by using the non-rotationally symmetrical even-order aspheric surface to correct aberration.
The first lens, the second lens and the third lens are made of different materials, so that when the ambient temperature changes, the refractive indexes of the lenses change to different degrees, the deviation of a focal plane caused by the temperature change can be compensated, and the optical athermal difference is realized.
The invention selects the optical glass material with high refraction and low dispersion, and matches with the rotationally symmetric even-order aspheric surface, thereby realizing the athermalization design of the optical system with larger field angle, and the optical system can clearly image in the temperature range of-40 ℃ to 60 ℃.
Drawings
FIG. 1 is a schematic structural diagram of a long-wave infrared athermalization optical system of the present invention;
FIG. 2 is a transfer function diagram of a long-wave infrared athermalization optical system at a normal temperature of 20 ℃;
FIG. 3 is a schematic view of a long-wave infrared athermalized optical system at a normal temperature of 20 ℃;
FIG. 4 is a transfer function diagram of a long-wave infrared athermalization optical system at a temperature of-40 deg.C;
FIG. 5 is a schematic diagram of a long-wave infrared athermalization optical system at a temperature of-40 deg.C;
FIG. 6 is a transfer function diagram of a long-wave infrared athermalized optical system at a high temperature of 60 ℃;
FIG. 7 is a schematic diagram of a long-wave infrared athermalized optical system at a high temperature of 60 deg.C;
FIG. 8 is a schematic structural view of comparative example 1;
FIG. 9 is a functional diagram of comparative example 1;
FIG. 10 is a schematic structural view of comparative example 2;
FIG. 11 is a functional diagram of comparative example 2;
FIG. 12 is a schematic structural view of comparative example 3;
fig. 13 is a transfer function diagram of comparative example 3.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, it being understood that the specific embodiments described herein are illustrative of the invention only and are not limiting. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meanings of the above terms in the present invention can be specifically understood in specific cases by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," or "beneath" a second feature includes the first feature being directly under or obliquely below the second feature, or simply means that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the long-wave infrared athermalization optical system of the present invention includes a protection cover 1, a first lens 2, a second lens 3, a third lens 4, a detector window 5 and a detector chip 6, which are sequentially disposed on the same optical axis along the propagation direction of incident light.
In the embodiment of the invention, the protective cover 1 is a zinc sulfide lens, has a thickness of 2 mm-4 mm, has good chemical stability, and plays a role of a protective mirror.
In an embodiment of the present invention, the first lens 2 is a meniscus convex lens with a convex surface facing the protective cover and is made of IRG204, the second lens 3 is a meniscus convex lens with a convex surface facing the protective cover and is made of ZNSE, and the third lens 4 is a biconvex lens and is made of IRG 209.
The detector window 5 is made of germanium plate glass.
In the embodiment of the present invention, the detector chip 6 is an uncooled focal plane detector, and the pixel size is 12um × 12um, the resolution is 640 × 512, and the diagonal height is 9.84 mm.
In the embodiment of the present invention, the front surface of the first lens 2 is a spherical surface, the back surface is a rotationally symmetric even aspheric surface, the front and back surfaces of the second lens 3 are both rotationally symmetric even aspheric surfaces, the front surface of the third lens 4 is a rotationally symmetric even aspheric surface, and the back surface is a spherical surface.
The surface equation of the rotationally symmetric even aspheric surface satisfies the equation:
in the above equation, the parameter c is the curvature radius of the rotationally symmetric even aspheric surface, and y is the radial coordinate, and the unit of the radial coordinate is the same as the unit of the curvature radius of the lens; k is a conic coefficient, and when the k coefficient is smaller than-1, the surface curve of the rotationally symmetric even aspheric surface is a hyperbolic curve; when the k coefficient is equal to-1, the surface type curve of the rotationally symmetric even aspheric surface is a parabola; when the k coefficient is more than-1 and less than 0, the surface type curve of the rotationally symmetric even aspheric surface is an ellipse; when the k coefficient is equal to 0, the surface type curve of the rotationally symmetric even aspheric surface is circular; when the k coefficient is larger than 0, the surface type curve of the rotationally symmetric even aspheric surface is oblate; in the invention, k is 0, and the rotationally symmetric even aspheric surface is circular; a is1To a8Respectively representing aspheric coefficients corresponding to the radial coordinates; alpha in the invention1、α6、α7、α8Are all 0.
As shown in figures 2 and 3, at a normal temperature of 20 ℃, the long-wave infrared athermalization optical system provided by the invention has a transfer function value of more than 0.4 in a central view field at a frequency of 42lp/mm within a wavelength range of 8-14um, a diffuse spot diameter of less than 8um close to a diffraction limit, and a diffuse spot size of far less than 12um, so that high-quality imaging is realized.
As shown in fig. 4 and 5, at a low temperature of-40 ℃, the long-wave infrared athermalization optical system provided by the invention has a central view field with a transfer function value of more than 0.38 at a frequency of 42lp/mm and a diffuse spot diameter of less than 10um, thereby realizing high-quality imaging at the low temperature.
As shown in FIGS. 6 and 7, at a high temperature of 60 ℃, the central field of view of the long-wave infrared athermalization optical system provided by the invention has a transfer function value of more than 0.38 at a frequency of 42lp/mm and a diffuse spot diameter of less than 9um, thereby realizing high-quality imaging at the high temperature.
The embodiments described herein are merely illustrative of several embodiments of the present invention, which are described in more detail and detail, and therefore should not be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
The optical design parameters of the long-wave infrared athermalized optical systems of examples 1-5 of the present invention are shown in tables 1-5, respectively. Where R is the radius of curvature of each optical surface, t is the distance from the subsequent optical surface, α2、α3、α4、α5Aspheric coefficients of 4 times, 6 times, 8 times and 10 times of the rotationally symmetric even aspheric surface respectively; the conic coefficient k of the rotationally symmetric even-order aspheric surface is equal to 0.
TABLE 1
In example 1, the infrared athermalized optical system consisting of the optical elements in table 1 achieved the following optical criteria:
focal length: 13.52 mm;
F/#：1.0；
wave band: 8-14 um;
the field angle: 16.2 ° × ± 12.3 °,20 °;
MTF: 0.4@42lp/mm, on-axis field of view;
ambient temperature: 40 ℃ below zero to 60 DEG C
TABLE 2
In example 2, the infrared athermalized optical system comprised of the above optical elements achieved the following optical criteria:
focal length: 13.55 mm;
F/#：1.0；
wave band: 8-14 um;
the field angle: 16.2 ° × ± 12.3 °,20 °;
MTF: 0.4@42lp/mm, on-axis field of view;
ambient temperature: 40 ℃ below zero to 60 DEG C
TABLE 3
In the embodiment, the infrared athermalization optical system composed of the optical elements achieves the following optical indexes:
focal length: 13.5 mm;
F/#：1.0；
wave band: 8-14 um;
the field angle: 16.2 ° × ± 12.3 °,20 °;
MTF: 0.4@42lp/mm, on-axis field of view;
ambient temperature: 40 ℃ below zero to 60 DEG C
TABLE 4
In example 4, the infrared athermalization optical system composed of the above optical elements achieved the following optical criteria:
focal length: 13.45 mm;
F/#：1.0；
wave band: 8-14 um;
the field angle: 16.2 ° × ± 12.3 °,20 °;
MTF: 0.4@42lp/mm, on-axis field of view;
ambient temperature: 40 ℃ below zero to 60 DEG C
TABLE 5
In example 5, the infrared athermalization optical system comprised of the above lens achieved the following optical criteria:
focal length: 13.48 mm;
F/#：1.0；
wave band: 8-14 um;
the field angle: 16.2 ° × ± 12.3 °,20 °;
MTF: 0.4@42lp/mm, on-axis field of view;
ambient temperature: 40 ℃ below zero to 60 DEG C
The invention matches with the non-refrigeration detector with the pixel size of 12um multiplied by 12um and the resolution of 640 x 512, and the non-refrigeration detector can clearly image under the condition of high resolution of 42lp/mm, thereby meeting the requirements of high-precision scenes on the imaging quality.
The invention can carry out aberration correction and balance on the wide spectral range of 8-14um, so that the system has excellent image quality in the wide spectral range, and the wide-spectrum confocal is realized.
Comparative example 1
Table 6 shows the optical design parameters of comparative example 1.
TABLE 6
In comparative example 1, the inventor adopts a ZNS spherical cover, a ZNSE lens, 2 IRG204 lenses and an IRG209 lens, and 5 lenses are optimized to realize the long-wave infrared athermalization. The field of view of the system MTF on the axis can reach 0.4@42lp/mm, other optical indexes are basically the same as those of the system provided by the invention, but compared with the long-wave infrared athermalization optical system provided by the invention, a lens is added, the complexity of the structure is increased, the miniaturization is not facilitated, and the cost is higher.
Comparative example 2
Table 7 shows the optical design parameters of comparative example 2.
TABLE 7
In comparative example 2, the inventors have optimized the design using one ZNS ball cover, one ZNSE lens, 1 IRG204 lens and 1 IRG209 lens, for a total of 4 lenses, to achieve long wave infrared athermalization. The field of view of the system MTF on the axis can only reach 0.1@42lp/mm, and compared with the long-wave infrared athermalization optical system provided by the invention, although the number and the materials of the lenses are the same, the image quality is poor and the use requirement cannot be met.
Comparative example 3
Table 8 shows the optical design parameters of comparative example 3.
TABLE 8
In comparative example 3, the inventors have optimized the design of 4 lenses, one ZNS ball cover, one ZNSE lens, 1 IRG204 lens and 1 GE _ LONG lens, to achieve LONG wave infrared athermalization. The field of view of the system MTF on the axis can only reach 0.2@42lp/mm, and clear imaging cannot be realized at the low temperature of minus 40 ℃, compared with the long-wave infrared athermalized optical system provided by the invention, the lens quantity and material collocation are different, and the image quality is poor and cannot meet the use requirement.
Claims (9)
1. A long-wave infrared athermalization optical system is characterized by comprising a protective cover (1), a first lens (2), a second lens (3), a third lens (4), a detector window (5) and a detector chip (6) which are sequentially arranged on the same optical axis along the propagation direction of incident light; the first lens (2) is a meniscus convex lens and is made of IRG 204; the second lens (3) is a meniscus convex lens and is made of ZNSE; the third lens (4) is a biconvex lens and is made of IRG 209; the front surface of the first lens (2) is a spherical surface, the rear surface of the first lens is a rotationally symmetric even-order aspheric surface, the front surface and the rear surface of the second lens (3) are both rotationally symmetric even-order aspheric surfaces, the front surface of the third lens (4) is a rotationally symmetric even-order aspheric surface, and the rear surface of the third lens is a spherical surface.
2. The long wave infrared athermalized optical system of claim 1 wherein said rotationally symmetric even aspheric surface has a profile that is preferably circular.
3. The longwave infrared athermalized optical system according to claim 1 or 2, characterized in that the first (2) and second (3) lenses are meniscus lenses with the convex surface facing the protective cover.
4. A long-wave infrared athermalization optical system according to claim 3, characterized in that the front and rear surfaces of the first lens (2) have radii of curvature of 12.067mm to 13.136mm and 13.91mm to 15.264mm, respectively, and have a thickness of 3.4mm to 3.6mm, the coefficient of 4 order of the rotationally symmetric even-order aspheric surface of the rear surface is-1.175250E-4 to-8.611977E-5, the coefficient of 6 order is-3.024415E-6 to-8.724273E-7, the coefficient of 8 order is 1.018666E-8 to 3.947737E-8, the coefficient of 10 order is-1.551786E-10 to-3.101294E-11, and the air gap between the rear surface of the first lens (2) and the front surface of the second lens (3) is 1.58mm to 2.22 mm.
5. The long-wave infrared athermalization optical system according to claim 3, wherein the curvature radii of the front and rear surfaces of the second lens (3) are 7.349 mm-8.955 mm and 6.056 mm-7.678 mm, respectively, the thickness is 1.9 mm-2.3 mm, the coefficient of 4 orders of the rotationally symmetric even aspheric surface of the front surface is-3.628704E-4-1.399185E-4, the coefficient of 6 orders is-2.231179E-5-6.873863E-6, the coefficient of 8 orders is-7.220687E-7-2.005046E-7, the coefficient of 10 orders is 8.669295E-9-1.380952E-8, the coefficient of 4 orders of the rotationally symmetric even aspheric surface of the rear surface is-7.997778E-5-3.071890E-4, the coefficient of 6 orders is-6.194896E-5-2.099981E-5, and the coefficient of 8 orders is-8.655113E-7-3.550900E-7, the coefficient of the 10-degree term is 9.840233E-9-2.832256E-8, and the air space between the back surface of the second lens (3) and the front surface of the third lens (4) is 4.56 mm-5.49 mm.
6. A long-wave infrared athermalization optical system according to claim 3, characterized in that the front and rear surfaces of said third lens (4) have radii of curvature of 95.993mm to 353.501mm and-24.872 mm to-21.812 mm, respectively, a thickness of 3.4mm to 4mm, the front surface thereof has a 4-degree coefficient of a rotationally symmetric even-order aspheric surface of-1.821586E-5 to 7.077677E-6, a 6-degree coefficient of 3.320459E-7 to 8.799710E-7, a 8-degree coefficient of-1.575133E-8 to-6.699063E-9, a 10-degree coefficient of 4.990043E-11 to 1.218380E-10, and an air separation between the rear surface of said third lens (4) and the front surface of said detector window (5) is 4mm to 4.17 mm.
7. The long-wave infrared athermalization optical system according to claim 1, wherein the protective cover (1) is a zinc sulfide lens having front and rear surfaces with radii of curvature of 15mm and 11 to 13mm, respectively, and a thickness of 2 to 4mm, and the air space between the rear surface of the protective cover (1) and the front surface of the first lens (2) is 7.4 to 8 mm.
8. The long-wave infrared athermalization optical system of claim 1, wherein the detector window (5) is a germanium plate glass having a thickness of 0.8mm to 1mm, and the air space between the rear surface of the detector window (5) and the front surface of the detector chip (6) is 1.6mm to 1.8 mm.
9. The long-wave infrared athermalization optical system of claim 1, wherein said detector chip (6) is an uncooled focal plane detector.
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| CN103837963A (en) * | 2014-01-24 | 2014-06-04 | 宁波舜宇红外技术有限公司 | Novel long-wave infrared athermalization camera lens with high light flux |
| CN103941379A (en) * | 2014-04-02 | 2014-07-23 | 宁波舜宇红外技术有限公司 | Novel long wave infrared prime camera lens |
| CN111183743B (en) * | 2015-07-30 | 2017-08-15 | 中国航天科工集团第三研究所第八三五八研究所 | Wide-band wide-temperature-range long-wave infrared athermalization lens |
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| RU2642173C1 (en) * | 2016-12-16 | 2018-01-24 | Акционерное общество "Новосибирский приборостроительный завод" (АО "НПЗ") | Athermalised wideangle lens for ir spectral region |
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| CN111443463A (en) * | 2020-05-18 | 2020-07-24 | 苏州东方克洛托光电技术有限公司 | Ultra-wide spectral band imaging lens |
| CN111474683A (en) * | 2020-05-29 | 2020-07-31 | 苏州东方克洛托光电技术有限公司 | High numerical aperture long wave infrared microscope head |
| CN112629669A (en) * | 2020-12-24 | 2021-04-09 | 西安中科立德红外科技有限公司 | Optical athermal infrared lens with two wave bands, common caliber and large target surface and optical system |
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